Kate Hudson reportedly failed to tell Dax Shepard their relationship was over.
Dax - who began dating the 'Almost Famous' actress in July - is said to have only discovered Kate had called time on their romance when his friend phoned him with the news.
A source told America's OK! magazine: "Dax got a phone call about it from a friend. He's upset that she didn't bother to say anything to him."
Kate - who has a three-year-old son, Ryder, from her marriage to Black Crowes frontman Chris Robinson - previously dated Owen Wilson, who she met on the set of 'You, Me and Dupree'.
The pair split in June following heated rows over Owen's wild behaviour.
However, sources claim the 'Wedding Crashers' actor never got over the break-up and was devastated when he saw pictures of Kate and Dax together.
Soon after the photos were published, Owen allegedly attempted to commit suicide and was rushed to a Los Angeles hospital.
Kate, 28, was told of her ex-lover's suicide attempt while filming her latest movie in Boston, and was left devastated by the news.